Some say there is evidence to support the growing anxieties. David Carpenter, a professor of environmental health sciences at the university at Albany, in New York, thinks there's a greater than 95 percent chance that power lines can cause childhood leukemia(白血病). Also there's a greater than 90 percent chance that cellphones can cause brain tumors. “It's apparent now that there's a real risk，” said Carpenter.the head of radiation epidemiology(流行病学) at the US National Cancer Institute, has looked at the same research as Carpenter but has reached a different conclusion. “I don't support warning labels for cellphones，” said Linet. “We don't have the evidence that there's much danger.”

　　Studies so far suggest a weak connection between EMFs(电磁场) and illness—so weak that it might not exist at all. A multinational investigation of cellphones and brain cancer, in 13 countries outside the US, has been underway for several years. It's funded in part by the European Union, in part by a cellphone industry group. The final report should come out later this year, but data so far don't suggest a strong link between cellphone use and cancer risk.

　　20．From the passage we can learn that some people are worried because________．

　　A．they have evidence that the use of cellphones can lead to cancer

　　B．they make a fuss over cellphone use

　　C．some experts have given a warning

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